D11721: Fix issues in models to pass ModelTest

[David Rosca]

drosca added inline comments.

INLINE COMMENTS

> broulik wrote in maps.h:116
> This creates a temporary list just to iterate it, better use iterators and then `key()` provided by it (I bet there's even a fancy `std` algorithm for what you're trying to do here)

Some fancy `std` algorithm gives me iterator, but I need index (and `std::distance` is another traverse because map iterator is not RandomAccessIterator).

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D11721

To: drosca, #plasma
Cc: davidedmundson, broulik, plasma-devel, ragreen, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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